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An impedance study on admiralty brass dezincification originated by microbiologically influenced corrosion
Author(s) -
Ibars J.R.,
Polo J.L.,
Moreno D.A.,
Ranninger C.,
Bastidas J.M.
Publication year - 2004
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.20197
Subject(s) - corrosion , brass , biofouling , electrical impedance , polarization (electrochemistry) , gravimetric analysis , materials science , dielectric spectroscopy , capacitive sensing , scanning electron microscope , diffraction , analytical chemistry (journal) , metallurgy , chemistry , composite material , electrochemistry , optics , electrode , electrical engineering , environmental chemistry , physics , biochemistry , organic chemistry , copper , membrane , engineering
In this article we describe a field study of biofouling and microbiologically influenced corrosion (MIC) of admiralty brass heat exchanger tubes in contact with running fresh water on the river Tagus close to Almaraz nuclear power plant in Spain. Dezincification originated by biofouling and MIC was studied using impedance, polarization resistance, gravimetric, scanning electron microscopy (SEM), and X‐ray diffraction (XRD) measurements. Close correlation was observed between the biofilms formed and the corrosion process (dezincification) using the different experimental techniques. Impedance data showed a capacitive behavior including two time constants. Kramers‐Kronig (KK) transforms were used to validate impedance data. The admiralty tubes' impedance data satisfied the KK relations. © 2004 Wiley Periodicals, Inc.